Secure Cross-Domain Data Sharing Technology Based on Blockchain.

Considering the difficulties of cross-domain data sharing and secure access tracking between multiple organizations, this paper proposes a cross-domain data sharing model based on blockchain and the features of cloud computing storage; puts forward a data sharing protocol via digital digest matching algorithm. By matching information within digital digest, this protocol can realize the restricted sharing of data while protecting data privacy. This paper also proposes a multi-level, secure storage architecture for data according to authorization, introduces a method for adding heterogeneous data to the chain, develops a data access mechanism and a privacy protection mechanism, and provides a solution for data storage and trusted sharing in untrusted environments.